The sub-frame in most deck construction projects will be pressure treated softwood timber. In order to maximise life span it is important to create ventilation gaps or portholes. Airflow prevents fungus and mould build up. The principal is similar to the roofs of most houses. (Ventilation and airflow will ensure that structural members: purlins, rafters and joists could last up to 100 years. Stagnant air, heat and humidity are the enemies of structural timber.)
One of our current projects is at a private dwelling, in Co Waterford, where we are installing a deck that is over 3 levels with 4 flights of stairs. This site is ove
